KR20080005264A - Lamp with one filament for a vehicle headlamp with a low beam, fog light, turning light or bending light function - Google Patents

Abstract

The invention relates to a lamp with one filament for a vehicle headlamp with a low beam, fog light, turning light or bending light function, which comprises at least an outer tube (3) and a light-emitting region (4) and which emits at least visible light from a number of regions of the outer tube (3), wherein at least one partial coating (2) is arranged on the outer tube (3) in such a way that, when the low beam, fog light, turning light or bending light function is implemented, the area of the traffic space which lies below the light/dark cut-off (F) can be illuminated in a first defined region with increased intensity and in a second defined region with reduced intensity and the partial coating (2) is an at least partially reflective coating.

Description

LAMP WITH ONE FILAMENT FOR A VEHICLE HEADLAMP WITH A LOW BEAM, FOG LIGHT, TURNING LIGHT OR BENDING LIGHT FUNCTION}

The present invention relates to a lamp having one filament for a vehicle headlamp having a low beam, fog light, turn signal or bending light function, which emits at least visible light from at least a plurality of areas of the outer tube and the outer tube. At least one partial coating in such a way that the area of the traffic space below the light / dark cut-off (F) can be illuminated when the low beam, fog light, turn signal or bending light function is executed. It is arrange | positioned at this outer tube.

In the context of the present invention, the term “outer tube” refers to the outermost tube in the case of lamps having two or more tubes and to a single tube in the case of lamps with only one tube.

In the context of the present invention, the lamps are incandescent lamps, in particular halogen lamps such as H1, H7, H9 and H11 lamps from Philips.

In the case of an incandescent lamp, the light emitting area is mainly an area of the incandescent filament.

In connection with the present invention, vehicle headlamps with a low beam function are all headlamps that produce a contrast cutoff, for example pure low beam headlamps or a combination of full beam and low beam headlamps. admit. Pure fog light headlamps, low beam and fog light combination headlamps and bending light headlamps are also relevant in this regard.

Lamps used in this application are for example incandescent lamps, in particular halogen lamps with one filament.

Such lamps to be used as vehicle headlamps comply with international standards with regard to their most important parameters, for example SAE and ECE standards, particularly relevant to the European or American market. For example, the light intensities to be observed in each case at a given location are accurately defined. For example, according to Regulation E112 applicable in Europe, the luminous intensity in the right half of the traffic space must meet a defined minimum value and the luminous intensity in the left half of the traffic space must not exceed the maximum specified value.

Thus, in the prior art, limited redistribution of brightness from the left half to the right half of the traffic space is more desirable than the uniform brightness distribution obtained with an uncoated light source.

This is because headlamps with a low beam function typically have lamps that emit visible light with almost uniform luminous intensity in all spatial directions perpendicular to the axis of the filament, allowing the traffic space to be homogeneously illuminated.

Increased brightness is known to improve road safety by improving the visibility of hazards in traffic spaces, such as traffic signs, for example, so that vehicle drivers can recognize them more quickly.

WO 2004/053924 A2 discloses a lamp for a vehicle headlamp having a low beam function comprising an outer tube and a light emitting area and emitting at least a different color of visible light from a plurality of areas of the outer tube, the low beam function being executed. At least one partial coating is disposed on the outer tube in such a way that at least a region of the traffic space above the contrast cutoff can be illuminated with visible color light scattered at least in part from the partial coating. At the same time, using such a lamp, the area of the traffic space below the contrast cutoff can be illuminated with visible light of different colors in defined areas. In the case of such partial coatings, absorbing coatings are mainly described as the scattered light scattered through the partial coating passes into the traffic space above the contrast cutoff. However, such scattered light is undesirable in some applications.

In the case of traffic driving on the right side, hazards or traffic signs disposed on the right side of the road in the driving direction of the vehicle are particularly hard to see in wet weather.

There is a need for lamps, in particular halogen lamps, which illuminate the traffic space below the contrast cutoff in some way, possibly in multiple colors, when implementing the main lighting function. These lamps should not expose any scattered light caused by the partial coating, above the contrast cutoff, and in particular with conventional reflectors in a known manner, illuminate the traffic space below the contrast cutoff in different areas at different luminosities. . Here, the aim is to achieve an increase in luminous intensity in the driver's traffic space-in the case of traffic driving on the right-especially in areas as far away from the vehicle, and no increase in luminous intensity is obtained in the area of oncoming traffic. Should not. It should be possible for certain areas of the traffic space in front of the vehicle, ie the areas mentioned above, to be illuminated with stronger or weaker brightness.

An object of the present invention is a coating which can be efficiently manufactured in factory mass production and exposes a wide range of luminosities recognizable in defined areas of the traffic space below the contrast cutoff, thus increasing roadbed safety when performing its main lighting functions. It is to provide a lamp comprising a lamp and a lighting device including the lamp.

The object of the invention is achieved by the features of claim 1.

Essentially of the present invention, when the low beam, fog, turn signal or bending light function is implemented, the area of the traffic space below the contrast cutoff is at an increased luminous intensity in the first predetermined area and at a reduced luminous intensity in the second predetermined area. At least one partial coating is disposed on the outer tube in an illuminating manner and the partial coating is at least partly a reflective coating.

Such illumination occurs as a result of the lamp according to the invention in its operating state functionally cooperating with a conventional reflector in a known manner.

In the context of the present invention, conventional reflectors are, in particular, commercially available reflectors for incandescent lamps, in particular having a rotationally symmetrical structure within the reflecting headlamps, for example in a known manner in terms of shape, structure and material selection. It is configured to suit the main function of each lamp.

The reflector may be part of a lamp or part of a structural device into which a lamp that does not itself include a reflector may be inserted for operation.

The lamp can in principle be used as a projection headlamp and a reflective headlamp, so that the partial coating should be arranged differently with respect to the installation position of the lamp, in a known manner.

According to the solution according to the invention, compared to a lamp without such a partial coating, the driver side-in the case of traffic driving on the right-increases the brightness in the area of the traffic space and reduces the brightness in the area of oncoming traffic of the traffic space. The light emission amount is distributed in such a way that is achieved.

Therefore, when used as a lamp for vehicle lighting in countries with traffic driving on the left side, the arrangement of the lamp in the reflector must be changed.

The choice of at least partially reflective coatings depends in particular on the criteria as to whether such coatings are color neutral with respect to other lamp properties. Color neutral coating is required.

In connection with the present invention, the partial coating which does not cover the entirety of the lamp tube from which the emitted light is emitted from the outer tube in the execution of the low beam function, in particular depends on the layer structure, It may be homogeneous or heterogeneous with respect to layer thickness and layer composition.

Such a coating may consist of a number of different partial regions arranged in a defined manner on a lamp tube, in particular on an outer tube, depending on their respective function.

In the execution of the low beam function, the traffic space below the contrast cutoff can be illuminated in such a way that due to the partial coating the luminous intensity is reduced in the first area and the luminous intensity increase is achieved in the second area.

It is preferred that the lamp with one filament is a halogen lamp, since the solution according to the invention can be transferred particularly efficiently to halogen lamps with respect to mass production, especially for the replacement parts market.

More preferably, the at least partially reflective coating has a reflectivity of greater than 20% and no greater than 100%. By this reflectivity, the differences in the light point of view can be particularly well recognized.

More preferably, the at least partially reflective coating is an interference coating.

Interference coatings typically do not cause scattered light at all. In addition, the absorption of visible light through the interference coating is negligible. The at least partially reflective coating is particularly preferably an interference coating that reflects light that is not color filtered. In this way, this reflected color-neutral light passes through the right side of the road-in the case of traffic driving on the right. This allows the luminosity in the area of the right roadside about 50 to 100 meters in front of the vehicle to be increased in comparison with a lamp without such interference coating.

With regard to the arrangement and shape of the partial coating, it is preferred that the coating is formed in a strip-like manner, with its longest dimension arranged parallel to the longitudinal axis of the lamp. This form makes it possible in particular for this coating to be produced in a technically simple manner.

In the case of traffic driving on the right, for the horizontal mounting position of the lamp, the coating on the cylindrical outer tube is 45 ° +/- 45 ° and / or 315 ° +/- 45 °, particularly preferably at its smaller dimensions. It is particularly preferable to cover the arc area with a width of 45 ° +/- 25 °.

The coordinate system has coordinates 0 ° and 180 ° on the horizontal axis of the virtual symmetry of the ramp, coordinates 90 ° and 270 ° on the vertical axis of the virtual symmetry of the ramp, and the 90 ° coordinate is above the 270 ° coordinate in the coordinate system. I will understand how it is arranged.

The defined dimensions and positions of the partial coatings increase the essential effect of the present invention. It has been found that the partial coating running along the tube axis at any position on the lamp, in particular the halogen lamp, generally does not cause a visible increase in brightness in the traffic space.

The object of the invention is also achieved by a lighting device comprising at least one lamp as claimed in claims 1-9.

The lighting device may comprise either a reflective headlamp or a projection headlamp.

The invention will be further described with reference to the embodiments shown in the figures, but the invention is not limited thereto.

1 is a schematic side view of a halogen lamp for a reflective headlamp.

2 shows a schematic cross section through a cylindrical part of the lamp 1;

3 is a schematic diagram of the light distribution of the lamp shown in FIG. 1 in a traffic space;

FIG. 1 is a schematic side view of an embodiment of a lamp 1 according to the invention, ie a halogen lamp for a reflective headlamp, before the lamp 1 is installed in a reflector. As a light source of the lamp 1, a filament 5 is arranged in the lamp tube, in which case the lamp tube is also the outer tube 3 of the lamp 1. A filament 5 having a length of about 5 mm and a width of 1 mm is connected to the return pole 7 and the power supply 8 in a conventional manner.

With regard to its outer contour, the luminous area 4 is mainly delimited by the area of the filament 5, in particular its outer areas. The light emitting region 4 can be described as being substantially cylindrical, the longitudinal axis of which extends parallel to the longitudinal axis 10 of the filament 5 and the partial coating 2. The substantially cylindrical light emitting region 4 has a diameter of about 1.2 mm and a length of about 5.2 mm.

The outer tube 3 is coupled to the cap (not shown in FIG. 1) in an airtight manner. At the end pointing in the direction of the traffic space in the installation position shown, a protective screen 6 in the form of a partial light impermeable coating is applied to the outer surface of the outer tube 3.

The partial coating 2 is generally disposed only on the part of the outer surface of the outer tube 3.

The outer tube 3 also has an area 9 having no coating at all, so that mainly unfiltered light emerges from this area 9.

Partial coating 2 is an interference coating comprising a plurality of layers.

The requirement regarding the temperature stability of the partial coating 2 is determined in particular by the temperatures typically between 600 and 800 ° C. which occur in the outer tube 3 of the lamp 1.

The partial coating 2, which is a dielectric coating, consists of at least two layers up to five layers and is applied by a known sputtering process, with the coating area masked with a mechanical mask. In this process, silicon dioxide is used as a material having a low refractive index, and titanium dioxide is used as a material having a high refractive index. Alternatively, zirconium dioxide or tantalum pentoxide may be used as a material having a higher refractive index. Each layer may have a thickness of 20 to 120 nm in each case and the overall coating has a thickness of at least 50 nm and at most 1500 nm. More details and indications regarding the detailed description of the partial coating can be found in US 20050024880.

The strip type interference filter 2 has a width of about 4 mm and a length of about 8 mm. This strip-shaped interference filter having a width of at least the light emitting region 4 is applied to the surface of the outer tube 3.

2 shows a schematic cross section through the cylindrical part of the lamp 1. The light emitting region 4 and the filament 5 are arranged below the intersection of the horizontal axis and the vertical axis of symmetry of the outer tube 3, which axes are shown in dashed lines in FIG. 1. An at least partially reflective coating 2 is disposed on the part of the outer surface of the lamp tube 3. On the cylindrical outer tube 3, the coating 2 covers an arc area with a width of 45 ° +/- 25 ° with its smaller dimensions. Here, the first coordinate, ie 45 °, describes the position of the virtual center point of the coating 2 on the surface of the outer tube 3 of the lamp 1 in a cross section similar to FIG. 2. The second coordinate, ie +/- 25 °, describes the smaller dimension of the strip-like coating 2 arranged in the form of an arc.

FIG. 2 shows an example of a reflective headlamp for traffic driving on the right side, and in an installed position, the viewer looking at FIG. 2 is looking towards the reflective headlamp from the traffic space. (On the other hand, FIG. If an example of a projection headlamp for traffic driving on the right is shown, a person looking at FIG. 2-at the installation position-will be looking toward the traffic space from the projection headlamp.)

In figure 2 the lamp 1 is shown in a manner similar to the installation position in a conventional reflector (not shown) which ensures the effect according to the invention. This horizontal installation position of the lamp 1 in the reflector (ie, arranged with the filament 5 positioned below the return pole 7 on a generally symmetrical vertical axis (virtual)) allows for the use of a headlamp for traffic driving on the right side. It is about.

FIG. 3 shows a schematic diagram of the light distribution in the traffic space of a lamp according to the invention as shown in FIG. 1 on a screen arranged vertically at 10 m in front of the vehicle when executing the low beam function.

3 includes A as a moving line of the driver's eyes of an oncoming vehicle; B is a line on the left side; C is the centerline of the roadway; D is the centerline of the right lane; E is the line on the right side of the road; F is the line of contrast cutoff; H is the reduced luminance region, G and I are the increased luminance regions, which are ranged upwards by the contrast cutoff line F.

Light passing through the partial coating 2 is projected into the traffic space near the contrast cutoff F. Light reflected through the partial coating 2 appears in the traffic space in the regions G and I. The contrast cutoff F is an area in the traffic space that separates the traffic space illuminated by the headlamp from the traffic space not illuminated by the headlamp.

Claims (10)

In a lamp having a single filament for a vehicle headlamp having a low beam, fog light, turn signal or bending light function, Comprising at least an outer tube 3 and a light emitting region 4, emitting at least visible light from a plurality of regions of the outer tube 3, when the low beam, fog light, turn signal or bending light function is executed, At least one partial coating 2 is applied to the outer tube in such a way that the area of the traffic space below the contrast cutoff F can be illuminated with increased luminous intensity in the first predetermined area and with reduced luminous intensity in the second predetermined area. A lamp disposed on (3), wherein the partial coating (2) is at least partially reflective coating. The method of claim 1, The lamp (1) is a halogen lamp. The method of claim 1, And the reflectivity of said at least partially reflective coating is greater than 20% and less than or equal to 100%. The method of claim 1, And the at least partially reflective coating is an interference coating. The method of claim 1, Wherein said at least partially reflective coating is an interference coating that specifically reflects light that is not color filtered. The method of claim 1, The coating (2) is formed in a strip shape, the longest dimension of which is arranged parallel to the longitudinal axis of the lamp. The method of claim 6, The coating 2 has a smaller dimension on the cylindrical outer tube 3 at 45 ° +/- 45 ° and / or 315 ° +/- 45 °, preferably 45 ° +/- 25 ° and / or 315 °. Lamp covering arc area with width of +/- 25 °. The method of claim 1, When the respective functions of the lamps are executed, in the traffic space below the contrast cutoff F, yellow light is dominant in the first region H, blue light is dominant in the second region G, and third region ( In I) a lamp in which light which is substantially unaffected by the coating (2) can be illuminated in a predominant manner. The method of claim 1, Lamp, characterized in that the coating (2) is homogeneous or heterogeneous in terms of the reflectivity. Lighting device comprising at least a lamp (1) according to claim 1.

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